Aryloxyalkylcarbamate-type derivatives, preparation method thereof and use of same in therapeutics

ABSTRACT

The invention relates to a compound of formula (I): 
                         
Wherein m, n, X, Y, R 1 , R 2 , R 3  and R 4  are as defined herein. The invention also relates to the use of same in therapeutics.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No. 12/195,906, filed Aug. 21, 2008, now allowed, which is a continuation of U.S. application Ser. No. 11/456,708, filed Jul. 11, 2006, now U.S. Pat. No. 7,439,257 B2, issued, Oct. 21, 2008, which is a continuation of International application No. PCT/FR2005/000,028, Jan. 7, 2005, both of which are incorporated herein by reference in their entirety; which claims the benefit of priority of French Patent Application No. 04/00,389, filed Jan. 16, 2004.

BACKGROUND OF THE INVENTION Field of the Invention

The invention relates to aryloxyalkyl-carbamate derivatives, to their preparation and to their application in therapy.

SUMMARY OF THE INVENTION

The compounds of the invention conform to the general formula (I):

in which

m represents 0, 1, 2 or 3;

n represents 0, 1, 2 or 3;

X represents an oxygen or sulfur atom or an

SO or SO₂ group;

R₁ and R₂ represent independently of one another a hydrogen atom or a C₁₋₃ alkyl group, or R₁ and R₂ together form a group —(CH₂)_(p)—, where p represents an integer ranging from 1 to 5 such that n+p is an integer ranging from 2 to 5;

R₃ represents a hydrogen or fluorine atom or a hydroxyl or methyl group;

R₄ represents a group of general formula CHR₅CONHR₆ in which

R₅ represents a hydrogen atom or a C₁₋₆ alkyl group and

R₆ represents a hydrogen atom or a C₁₋₆ alkyl, C₃₋₇ cycloalkyl or C₃₋₇ cycloalkyl-C₁₋₆ alkylene group;

Y represents

a group Y₂ selected from in particular a phenyl, pyridinyl, pyridazinyl, pyrimidinyl, pyrazinyl, triazinyl, thiazolyl, naphthyl, quinolinyl, isoquinolinyl, phthalazinyl, quinazolinyl, quinoxalinyl, naphthyridinyl, cinnolinyl, benzofuranyl, dihydrobenzofuranyl, benzothienyl, dihydrobenzothienyl, indolyl, isoindolyl, indolinyl, benzimidazolyl, benzoxazolyl, benzisoxazolyl, benzothiazolyl, benzisothiazolyl, benzotriazolyl, benzoxadiazolyl and benzothiadiazolyl; the group Y₁ being optionally substituted by one or more substituents Y₂, which are identical to or different from one another, or by a group Y₃;

Y₂ represents a halogen atom or a cyano, nitro, C₁₋₈ alkyl, C₁₋₈ alkoxy, C₁₋₈ thioalkyl, C₁₋₈ fluoroalkyl, C₁₋₈ fluoroalkoxy, C₁₋₈ fluorothioalkyl, C₃₋₇ cycloalkyl, C₃₋₇ cycloalkyloxy, C₃₋₇ cycloalkyl-C₁₋₈ alkylene, C₃₋₇ cycloalkyl-C₁₋₈ alkyloxy, hydroxyl, NR₇R₈, NHCOR₇, NHSO₂R₇, COR₇, CO₂R₇, CONR₇R₈, SO₂R₇, SO₂NR₇R₈, —O—C₁₋₃ alkylene)-O—, phenyloxy, phenylthio, phenyl-C₁-C₈ alkylene, phenyl-C₁-C₈ alkyloxy or phenyl-C₁-C₈ alkylthio group;

Y₃ represents a group selected from in particular a phenyl, pyridinyl, pyrimidinyl, pyrazinyl or pyridazinyl;

it being possible for the group or groups Y₃ to be substituted by one or more groups Y₂ which are identical to or different from one another;

R₇ and R₈ represent independently of one another a hydrogen atom or a C₁₋₆ alkyl group, or with the nitrogen atom carrying them form an azetidine, pyrrolidine, piperidine, morpholine, thiomorpholine, azepine or piperazine ring optionally substituted by a C₁₋₃ alkyl or benzyl group.

DETAILED DESCRIPTION OF THE INVENTION

Among the compounds of general formula (I) a first group of compounds is that for which:

Y represents

a group Y₁ selected from in particular a phenyl, pyridinyl, pyrimidinyl, thiazolyl, naphthyl, quinolinyl, isoquinolinyl and benzoxazolyl; the group Y₁ being optionally substituted by one or more substituents, more particularly by one or two substituents, Y₂, which are identical to or different from one another, or by a group Y₃;

Y₂ represents a halogen atom, more particularly a chlorine, a fluorine or a bromine, a cyano, C₁₋₈ alkyl, more particularly a methyl, isopropyl, butyl, tert-butyl or tetramethylbutyl, C₁₋₈ alkoxy, more particularly a methoxy, ethoxy or propoxy, C₁₋₈ fluoroalkyl, more particularly a trifluoromethyl, C₁₋₈ fluoroalkoxy, more particularly a trifluoromethoxy, phenyloxy or phenyl-C₁-C₈ alkylene group, more particularly a phenyl(1,1-dimethylmethylene);

Y₃ represents a phenyl group; it being possible for Y₃ to be substituted by one or more groups, more particularly by one or two groups, Y₂ which are identical to or different from one another.

Among the compounds of the first group as defined above a second group of compounds is that for which:

Y represents

a group Y₁ selected from in particular a phenyl or a naphthyl; the group Y₁ being optionally substituted by one or more substituents, more particularly by one or two substituents, Y₂, which are identical to or different from one another, or by a group Y₃;

Y₂ represents a halogen atom, more particularly a chlorine, a fluorine or a bromine, a cyano, C₁₋₈ alkyl, more particularly a methyl, isopropyl, butyl, tert-butyl or tetramethylbutyl, C₁₋₈ alkoxy, more particularly a methoxy, ethoxy or propoxy, C₁₋₈ fluoroalkyl, more particularly a trifluoromethyl, C₁₋₈ fluoroalkoxy, more particularly a trifluoromethoxy, phenyloxy or phenyl-C₁-C₈ alkylene group, more particularly a phenyl (1,1-dimethylmethylene);

Y₃ represents a phenyl group; it being possible for Y₃ to be substituted by one or more groups, more particularly by one or two groups, Y₂ which are identical to or different from one another.

Among the compounds of general formula (I) a third group of compounds is that for which:

m represents 0, 1, 2 or 3; and/or

n represents 0, 1, 2 or 3; and/or

R₁ and R₂ represent independently of one another a hydrogen atom or a C₁₋₃ alkyl group, or R₁ and

R₂ together form a group —(CH₂)_(p)—, where p represents an integer ranging from 1 to 5 such that n+p is an integer ranging from 2 to 5;

with the proviso that, when R₁ and R₂ represent independently of one another a hydrogen atom or a C₁₋₃ alkyl group, m+n>1.

Among the compounds of the third group as defined above, a fourth group of compounds is that for which:

m represents 0, 1, 2 or 3; and/or

n represents 0, 1, 2 or 3; and/or

R₁ and R₂ together form a group —(CH₂)_(p)—, where p represents an integer ranging from 1 to 4 such that n+p is equal to 4.

Among the compounds of general formula (I), a fifth group of compounds is that for which X represents an oxygen atom.

Among the compounds of general formula (I), a sixth group of compounds is that for which R₃ represents a hydrogen atom.

A seventh group is formed of the compounds for which simultaneously R₁, R₂, R₃, R₄, R₅, R₆, R₇, R₈, X, Y, Y₁, Y₂, Y₃, n and m are as defined in the subgroups of compounds above.

The compounds of general formula (I) may include one or more asymmetric carbons. They may exist in the form of enantiomers or diastereoisomers. These enantiomers and diastereoisomers, and also mixtures thereof, including the racemic mixtures, form part of the invention.

The compounds of formula (I) may exist in the form of bases or of addition salts with acids. Such addition salts form part of the invention.

These salts are advantageously prepared with pharmaceutically acceptable acids, although the salts of other acids which are of use, for example, for purifying or isolating compounds of formula (I) likewise form part of the invention. The compounds of general formula (I) may be in the form of hydrates or solvates, namely in the form of associations or combinations with one or more molecules of water or with a solvent. Such hydrates and solvates likewise form part of the invention.

In the context of the invention the terms are understood as follows:

C_(t-z), where t and z may take the values from 1 to 8, is a carbon chain which may have from t to z carbon atoms; for example, C₁₋₃ is a carbon chain which may have from 1 to 3 carbon atoms;

alkyl is a saturated, linear or branched aliphatic group; for example, a C₁₋₃ alkyl group represents a linear or branched carbon chain of 1 to 3 carbon atoms, more particularly a methyl, ethyl, propyl or 1-methylethyl;

alkylene is a saturated, linear or branched divalent alkyl group; for example, a C₁₋₃ alkylene group represents a linear or branched, divalent carbon chain of 1 to 3 carbon atoms, more particularly a methylene, ethylene, 1-methylethylene, propylene or 1,1-dimethylmethylene;

cycloalkyl is a cyclic alkyl group; for example, a C₃₋₅ cycloalkyl group represents a cyclic carbon group of 3 to 5 carbon atoms, more particularly a cyclopropyl, cyclobutyl or cyclopentyl;

alkenylene is a divalent unsaturated aliphatic group containing at least 2 carbons, more particularly an ethylene;

alkoxy is an —O-alkyl group having a saturated, linear or branched aliphatic chain;

thioalkyl is an —S-alkyl group having a saturated linear or branched aliphatic chain;

fluoroalkyl is an alkyl group in which one or more hydrogen atoms have been substituted by a fluorine atom;

fluoroalkoxy is an alkoxy group in which one or more hydrogen atoms have been substituted by a fluorine atom;

fluorothioalkyl is a thioalkyl group in which one or more hydrogen atoms have been substituted by a fluorine atom; and

-   -   a halogen atom is a fluorine, a chlorine, a bromine or an         iodine.

The compounds of the invention may be prepared according to different methods, which are illustrated by the schemes which follow.

Thus one method of preparation (Scheme 1) consists in reacting an amine of general formula (II), in which Y, X, R₁, R₂, R₃, m and n are as defined in the general formula (I), with a carbonate of general formula (III), in which Z represents a hydrogen atom or a nitro group, R₅ is as defined in the general formula (I) and R represents a methyl or ethyl group, in a solvent such as toluene or dichloroethane, at a temperature of between 0 and 80° C. The resultant carbamate esters of general formula (IV) are subsequently converted into compounds of general formula (I) by aminolysis, by means of an amine of general formula R₆NH₂ where R₆ is as defined in the general formula (I). The aminolysis reaction may be carried out in a solvent such as methanol or ethanol, or a mixture of solvents such as methanol and tetrahydrofuran.

Another method (Scheme 2) of obtaining the compounds of general formula (I) in which R₂ represents more particularly a hydrogen atom consists in reacting a derivative of general formula (IIa) in which W represents a hydroxyl, mesylate or tosylate group or a chlorine, bromine or iodine atom, and in which Y, X, R₁, R₃, m and n are as defined in the general formula (I), with an oxazolidine dione of general structure (V), in which R₅ is as defined in the general formula (I), to give the oxazolidine dione derivative of general structure (VI). In the case where W represents a hydroxyl group the reaction may be conducted according to the conditions of Mitsunobu (Synthesis, 1981, 1-28); for example, by the action of diethyl or diisopropyl azodicarboxylate in the presence of triphenylphosphine. In the case where W represents a chlorine, bromine or iodine atom or a mesylate or tosylate group the reaction may be conducted in the presence of a base such as 1,1,3,3-tetramethylguanidine, sodium hydride or sodium tert-butoxide in a solvent such as tetrahydrofuran, acetonitrile or dimethylformamide at a temperature of between 0° C. and the reflux temperature of the solvent. The resultant oxazolidine dione derivative of general formula (VI) is subsequently converted into a compound of general formula (I) by aminolysis, by means of an amine of general formula R₆NH₂ where R₆ is as defined in the general formula (I).

Another variant (Scheme 3), for obtaining the compounds of general formula (I) in which X represents more particularly an oxygen atom, consists in reacting an alcohol derivative of general formula (VIIa), (VIIb) or (VIIc) with a phenol derivative of general structure YOH, in which the Y is as defined in the general formula (I), for example in accordance with the Mitsunobu reaction conditions (Synthesis, 1981, 1-28) or modified conditions (Tetrahedron Letters 1993, 34, 1639-1642), the carbamate ester (IVa) and oxazolidine dione (VIa) derivatives being subsequently converted into compounds of general formula (I) by aminolysis reaction by means of an amine of general structure R₆NH₂ where R₆ is as defined in the general formula (I).

In the general formulae (VIIa), (VIIb) and (VIIc), the groups R₁, R₂, R₃, R₅, R₆, m, n and R are as defined above.

Another variant (Scheme 4) for obtaining the compounds of general formula (I) in which Y represents more particularly a group Y₂—Y₃ of aryl-aryl, aryl-heteroaryl, heteroaryl-aryl or heteroaryl-heteroaryl type, consists in reacting an aryl halide derivative of general structure (VIII), in which U is a bromine or iodine atom and Y₂, X, R₁, R₂, R₃, R₅, R₆, n and m are as defined in the general formula (I), with an arylboronic or heteroarylboronic acid derivative of formula Y₃B(OH)₂, where Y₃ is as defined in the general formula (I), in accordance with the Suzuki reaction conditions (Chem. Rev. 1995, 95, 2457-2483) or with an aryl- or heteroaryl-tri-alkylstannane derivative of formula Y₃Sn(R′)₃, where Y₃ is as defined in the general formula (I) and R′ is a C₁₋₄ alkyl, in accordance with the Stille reaction conditions (Angew. Chem. Int. Ed. 1986, 25, 504-524).

The compounds of general formulae (II), (IIa), (III), (V), (VIIa), (VIIb), (VIIc) and (VIII) and the phenol derivatives of general structure YOH, when the method by which they are prepared is not described, are available commercially or are described in the literature, or else may be prepared according to methods which are described therein or which are known to the person skilled in the art.

The amines of general formula R₆NH₂ are available commercially.

The examples which follow illustrate the preparation of some compounds of the invention. These examples are not limitative, and merely illustrate the invention. The microanalyses, the IR and NMR spectra and/or the LC-MS (Liquid Chromatography coupled to Mass Spectroscopy) confirm the structures and purities of the compounds obtained.

m.p. (° C.) represents the melting point in degrees Celsius.

The numbers indicated in parentheses in the titles of the examples correspond to those from the 1st column of the table thereafter.

The IUPAC (International Union of Pure and Applied Chemistry) nomenclature has been used for naming the compounds in the following examples. For example, for the biphenyl group, the following numbering has been respected:

Example 1 Compound 1 2-(methylamino)-2-oxoethyl{2-[(4-chlorophenyl)-oxy]ethyl}carbamate

1.1 ethyl [(phenyloxycarbonyl)oxy]acetate

A solution of 25 g (240 mmol) of ethyl glycolate and of 55 ml (315 mmol) of diisopropylethylamine in 500 ml of toluene is admixed slowly at ambient temperature with 32 ml (256 mmol) of phenyl chloroformate. Stirring is continued at ambient temperature for 2 hours. The salt formed is separated off and the filtrate is concentrated under reduced pressure. This gives 53.7 g of oily product, used as it is in the following step.

1.2. ethyl{[({2-[(4-chlorophenyl)oxy]ethyl}-amino)carbonyl]oxy}acetate

A solution of 0.6 g (3.5 mmol) of [(4-chloro-phenyl)oxy]ethylamine (Chim. Ther. 1973, 8, 259-270) and 1.3 g (5.8 mmol) of ethyl [(phenyloxy-carbonyl)oxy]acetate, prepared in Step 1.1., in 30 ml of toluene is heated at 60° C. overnight. It is evaporated to dryness and the product is purified by chromatography on silica gel, eluting with a 30/70 mixture of ethyl acetate and cyclohexane. This gives 0.7 g of oily product, containing ˜10% of cyclized oxazolidine dione product, used as it is in the following step.

1.3. 2-(methylamino)-2-oxoethyl{2-[(4-chlorophenyl)oxy]ethyl}carbamate

3.5 ml (7 mmol) of a 2M solution of methylamine in tetrahydrofuran are added to a solution of 0.7 g (2.3 mmol) of ethyl{[({2-[(4-chlorophenyl)-oxy]ethyl}amino)carbonyl]oxy}acetate, prepared in Step 1.2., in 5 ml of methanol. The mixture is left to react at ambient temperature overnight. It is evaporated to dryness and the residual solid is washed with hexane and then with diisopropyl ether, to give 0.59 g of product in powder form.

Melting point (° C.): 147-149

LC-MS: M+H=287

¹H NMR (DMSO) δ(ppm): 7.75 (m, 1H), 7.40 (m, 1H), 7.25 (d, 2H), 6.95 (d, 2H), 4.35 (s, 2H), 3.95 (t, 2H), 3.35 (m, 2H), 2.60 (d, 3H).

Example 2 Compound 11 2-amino-2-oxoethyl (2-[(4-cyanophenyl)oxy]ethyl)-carbamate 2.1 3-(2-hydroxyethyl)-1,3-oxazolidine-2,4-dione

A solution of 3 ml (39.6 mmol) of methyl glycolate in 25 ml of tetrahydrofuran is added dropwise over 2 hours to a solution of 49 ml (95 mmol) of phosgene, 1.9M in toluene, which is diluted in 50 ml of tetrahydrofuran and cooled using an ice bath. The mixture is subsequently stirred at ambient temperature for 16 hours and evaporated to dryness. Coevaporation is carried out 4 times with 30 ml of dichloromethane. The residue is taken up with 40 ml of acetonitrile and added dropwise over 1 hour to a solution of 3.4 ml (59.4 mmol) of ethanolamine and 30 ml (178 mmol) of diisopropylethylamine in a 50/10 mixture of acetonitrile and dichloromethane, cooled using an ice bath. The mixture is subsequently stirred at ambient temperature for 16 hours. It is filtered over celite and evaporated to dryness and the product is purified by chromatography on silica gel, eluting with a 70/30 then 80/20 mixture of ethyl acetate and n-hexane, to give 4.9 g of product in white solid form.

2.2. 2-amino-2-oxoethyl (2-[(4-cyanophenyl)-oxy]ethyl)carbamate

0.61 ml (1.35 mmol) of a 2.2M solution of diethyl azodicarboxylate in toluene is added dropwise to a solution of 0.13 g (0.88 mmol) of 3-(2-hydroxyethyl)-1,3-oxazolidine-2,4-dione, prepared in Step 2.1., 0.35 g (1.35 mmol) of triphenylphosphine and 0.10 g (0.89 mmol) of 4-hydroxybenzonitrile in 2 ml of benzene, cooled using an ice bath. The reaction mixture is subsequently stirred at ambient temperature for 16 hours. It is evaporated to dryness and the product is purified by chromatography on silica gel, eluting with a 99/1 then 98/2 mixture of dichloromethane and ethyl acetate. The product is taken up in 1.5 ml of a 7M solution of ammonia (10.5 mmol) in methanol. This solution is stirred for one hour. The precipitate is filtered off and washed with ethyl acetate, to give 0.035 g of white solid.

Melting point (° C.): 204-206

LC-MS: M+H=264

¹H NMR (DMSO) δ(ppm): 7.55 (d, 2H), 7.05 (m, 1H), 6.90-6.80 (m+d, 4H), 4.35 (s, 2H), 4.05 (t, 2H), 3.45 (m, 2H)

Example 3 Compound 58 2-amino-2-oxoethyl [4-(1-naphthalenyloxy]butyl]-carbamate

3.1. 3-[4-(1-naphthalenyloxylbutyl]-1,3-oxazolidine-2,4-dione

A solution of 3.1 g (11.1 mmol) of 1-[(4-bromobutyl)oxy]naphthalene (Eur. J. Med. Chem. 1997, 32, 175-179) and 1.35 g (13.3 mmol) of 1,3-oxazolidine-2,4-dione (J. Med. Chem. 1991, 34, 1542-1543) in 30 ml of tetrahydrofuran is admixed dropwise with a solution of 2.55 g (22.2 mmol) of 1,1,3,3-tetramethylguanidine in 15 ml of tetrahydrofuran. The mixture is heated at reflux for 8 hours. 0.28 g (2.7 mmol) of 1,3-oxazolidine-2,4-dione and 0.32 g (2.7 mmol) of 1,1,3,3-tetramethylguanidine are added and the mixture is heated at reflux for 4 more hours. The reaction mixture is cooled using an ice bath, and 100 ml of ethyl acetate and then 50 ml of 1M aqueous hydrochloric acid are added. The system is decanted and the aqueous phase is extracted with 2×80 ml of ethyl acetate. The organic phases are subsequently washed with 80 ml of water and then with 80 ml of saturated aqueous sodium chloride solution. They are dried over sodium sulfate and then evaporated to dryness. The product is purified by chromatography on silica gel, eluting with an 80/20 mixture of cyclohexane and ethyl acetate, to give 2.0 g of product, which is used as it is in the following step.

3.2. 2-amino-2-oxoethyl [4-(1-naphthalenyl-oxy)butyl]carbamate

1.50 g (5.0 mmol) of 3-[4-(1-naphthalenyl-oxy)butyl]-1,3-oxazolidine-2,4-dione, prepared in Step 3.1., are dissolved in a mixture of 10 ml of tetrahydrofuran and 28 ml of a 7N solution of ammonia (200 mmol) in methanol. The solution is left to react overnight at ambient temperature and then evaporated to dryness. The product is purified by chromatography on silica gel, eluting with a 97/3 mixture of dichloromethane and methanol. It is recrystallized from ethyl acetate and then washed with diethyl ether, to give 0.73 g of product in white solid form.

Melting point (° C.): 80-82

LC-MS: M+H=317

¹H NMR (CDCl₃) δ(ppm): 8.25 (dd, 1H), 7.80 (dd, 1H), 7.55-7.30 (m, 4H), 6.80 (d, 1H), 6.00 (m, 1H), 5.65 (m, 1H), 5.05 (m, 1H), 4.65 (s, 2H), 4.20 (t, 2H), 3.35 (m, 2H), 2.00 (m, 2H), 1.90 (m, 2H)

Example 4 Compound 85 2-(methylamino)-2-oxoethyl 4-[(4′-fluoro-4-biphenyl)-oxy]-1-piperidinecarboxylate

4.1. 1,1-dimethylethyl 4-[(4-bromophenyl)-oxy]-1-piperidinecarboxylate

A solution of 2.01 g (10 mmol) of 1,1-dimethylethyl 4-hydroxy-1-piperidinecarboxylate in 20 ml of dimethylformamide is admixed with 7 g (40 mmol) of 1-bromo-4-fluorobenzene and 2.5 g (50 mmol) of sodium hydride at 50% in mineral oil. The mixture is stirred at 100° C. for 3 hours and then evaporated to dryness. The residue is taken up in 50 ml of ice-water and extracted with dichloromethane. The organic extracts are evaporated to dryness, to give 3.5 g of an oily product, which is used as it is in the following step.

4.2. 4-[(4-bromophenyl)oxy]piperidine

A solution of 3.5 g (9.83 mmol) of 1,1-dimethylethyl 4-[(4-bromophenyl)oxy]-1-piperidinecarboxylate, prepared in Step 4.1., in 20 ml of dichloromethane is admixed with 10 ml of trifluoroacetic acid and the solution is stirred at ambient temperature for 1 hour. It is evaporated to dryness and then the residue is taken up in 30 ml of toluene, which is evaporated again to dryness. The residue is subsequently washed with pentane and then taken up in a mixture of 60 ml of dichloromethane and 20 ml of 4N aqueous ammonia solution. It is stirred vigorously for 15 minutes and then the organic phase is decanted, dried over sodium sulfate and evaporated to dryness, to give 2.7 g of product in oil form, which is used as it is in the following step.

4.3. 2-(ethyloxy)-2-oxoethyl 4-[(4-bromo-phenyl)oxy]-1-piperidinecarboxylate

2.7 g (7.58 mmol) of 4-[(4-bromophenyl)-oxy]piperidine, prepared in Step 4.2., and 1.70 g (7.6 mmol) of ethyl{[(phenyloxy)carbonyl]oxy}acetate, prepared in accordance with Example 1.1, are mixed in 40 ml of toluene and the solution is heated at 50° C. for 20 hours. After cooling, it is evaporated to dryness and the product is purified by chromatography on silica gel, eluting with a 40/60 mixture of ethyl acetate and cyclohexane. The eluate is subsequently triturated in diisopropyl ether, to give 2.9 g of product in powder form.

Melting point (° C.): 87-88

4.4. 2-(methylamino)-2-oxoethyl 4-[(4-bromophenyl)oxy]-1-piperidinecarboxylate

2.9 g (7.5 mmol) of 2-(ethyloxy)-2-oxoethyl 4-[(4-bromophenyl)oxy]-1-piperidinecarboxylate, prepared in Step 4.3., in solution in 10 ml of a 33% ethanolic solution of methylamine are stirred at ambient temperature for 20 hours. Following evaporation, the product is purified by chromatography on silica gel, eluting with ethyl acetate, to give 0.8 g of product in gum form, which is used as it is in the following step.

4.5. 2-(methylamino)-2-oxoethyl 4-[(4′-fluoro-4-biphenyl)oxy]-1-piperidinecarboxylate

0.1 g (0.27 mmol) of 2-(methylamino)-2-oxoethyl 4-[(4-bromophenyl)oxy]-1-piperidinecarboxylate, prepared in Step 4.4., 0.01 g of tetrakis(triphenylphosphine)palladium(0) and 0.057 g (0.4 mmol) of 4-fluorophenylboronic acid are placed in a glass tube with stopper. 4 ml of toluene, 2 ml of a 2N aqueous solution of sodium carbonate and 0.5 ml of ethanol are added. The mixture is heated at 80° C. with stirring for 2 hours. After it has cooled, 1 ml of water and 2 ml of toluene are added. The organic phase is withdrawn and the product is purified by chromatography on silica gel, eluting with a 95/5 mixture of dichloromethane and methanol. The product is redissolved in 1 ml of ethanol and then reprecipitated by adding 2 ml of water, to give 0.031 g of product in powder form.

Melting point (° C.): 117-119

LC-MS: M+H 387

¹H NMR (CDCl₃) δ(ppm): 7.70 (dd, 2H), 7.65 (d, 2H), 7.30 (dd, 2H), 7.20 (d, 2H), 6.25 (broad s, 1H), 4.80 (s+m, 3H), 4.00-3.70 (m, 4H), 3.05 (d, 3H), 2.25-2.00 (m, 4H)

Example 5 Compound 120 2-(methylamino)-2-oxoethyl 4-{[(4-bromophenyl)oxy]-methyl}-1-piperidinecarboxylate

5.1. 1,1-dimethylethyl 4-{[(4-bromophenyl)-oxy]methyl}-1-piperidinecarboxylate

The procedure described in Example 4.1. is repeated. Starting from 2.5 g (11.6 mmol) of 1,1-dimethylethyl 4-(hydroxymethyl)-1-piperidinecarboxylate and 8.13 g (46.4 mmol) of 1-bromo-4-fluorobenzene gives 5.75 g of crude product in oil form.

5.2. 4-{[(4-bromophenyl)oxy]methyl}piperidine

The procedure described in Example 4.2 is repeated. Starting from 5.75 g of 1,1-dimethylethyl 4-{[(4-bromophenyl)oxy]methyl}-1-piperidinecarboxylate, prepared in Step 5.1, gives 3 g of product in oil form.

5.3. 2-(ethyloxy)-2-oxoethyl 4-{[(4-bromophenyl)oxy]methyl}-1-piperidinecarboxylate

The procedure described in Example 4.3. is repeated. Starting from 1.6 g (5.9 mmol) of 4-{[(4-bromophenyl)oxy]methyl}piperidine, prepared in Step 5.2., and from 1.32 g (5.9 mmol) of ethyl {[(phenyloxy)carbonyl]oxy}acetate, prepared in accordance with Example 1.1., gives the product in oil form.

5.4. 2-(methylamino)-2-oxoethyl 4-{[(4-bromophenyl)oxy]methyl}-1-piperidinecarboxylate

The procedure described in Example 4.4. is repeated. Starting from 2-(ethyloxy)-2-oxoethyl 4-{[(4-bromophenyl)oxy]methyl}-1-piperidinecarboxylate, prepared in Step 5.3, gives 1.1 g of product in powder form.

Melting point (° C.): 163-165

LC-MS: M+H=386

¹H NMR (CDCl₃) δ(ppm): 7.35 (d, 2H), 6.75 (d, 2H), 6.05 (broad s, 1H), 4.70-4.50 (m, 2H), 4.30-4.10 (m, 2H), 3.80 (d, 2H), 3.00-2.75 (m, 2H), 2.85 (d, 3H), 2.10-1.80 (m, 3H), 1.45-1.20 (m, 2H)

Example 6 Compound 154 2-(methylamino)-2-oxoethyl 4-{[(4′-(trifluoromethyl)-4-biphenyl)oxy]methyl}-1-piperidinecarboxylate

The procedure described in Example 4.5. is repeated. Starting from 0.1 g (0.26 mmol) of 2-(methylamino)-2-oxoethyl 4-{[(4-bromophenyl)oxy]methyl}-1-piperidinecarboxylate, prepared in accordance with Example 5, and from 0.074 g (0.389 mmol) of 4-trifluoromethylphenyl-boronic acid gives 0.049 g of product in powder form.

Melting point (° C.): 197-199

LC-MS: M+H=451

¹H NMR (DMSO) δ(ppm): 7.85-7.65 (m, 7H), 7.05 (d, 2H), 4.35 (s, 2H), 4.05 (broad d, 2H), 3.90 (d, 2H), 2.85 (m, 2H), 2.60 (d, 3H), 2.00 (m, 1H), 1.80 (broad d, 2H), 1.35-1.10 (m, 2H).

Example 7 Compound 137 2-amino-2-oxoethyl 4-[(1-naphthalenyloxy)methyl]-1-piperidinecarboxylate

7.1. 1,1-dimethylethyl 4-[(1-naphthalenyl-oxy)methyl]-1-piperidinecarboxylate

A solution of 5.0 g (23.2 mmol) of 1,1-dimethylethyl 4-(hydroxymethyl)-1-piperidine-carboxylate, 4.3 g (29.8 mmol) of 1-naphthalenol and 7.82 g (29.8 mmol) of triphenylphosphine in 120 ml of tetrahydrofuran, cooled under nitrogen by means of an ice bath, is admixed dropwise with a solution of 6.03 g (29.8 mmol) of diisopropyl azodicarboxylate. The reaction mixture is allowed to return to ambient temperature and stirring is continued overnight. 2 ml of methanol are added and then the mixture is evaporated to dryness. The residue is taken up in 200 ml of dichloromethane and washed in succession with a 10% aqueous potassium hydrogen sulfate solution, water and a 1M aqueous solution of sodium hydroxide. The system is dried over sodium sulfate and evaporated to dryness. The product is purified by chromatography on silica gel, eluting with an 80/20 then 70/30 and 50/50 mixture of cyclohexane and dichloromethane, to give 7.96 g of product in oil form, which solidifies.

Melting point (° C.): 97-100

7.2. 4-[(1-naphthalenyloxy)methyl]piperidine

A solution of 7.96 g (29.1 mmol) of 1,1-dimethylethyl 4-[(1-naphthalenyloxy)methyl]-1-piperidinecarboxylate, prepared in Step 7.1., in 120 ml of methanol and 28 ml of 35% aqueous hydrochloric acid is heated at 60° C. for 6 hours. It is cooled to ambient temperature and evaporated to dryness, and then coevaporation is carried out twice with ethanol. The solid residue is washed with diethyl ether and then dried under vacuum in the presence of phosphorus pentoxide, to give 3.1 g of white solid.

The solid is taken up in 80 ml of water and a 30% aqueous sodium hydroxide solution is added until a basic pH is obtained, after which the system is extracted twice with 150 ml of diethyl ether. The extracts are dried over sodium sulfate and concentrated to dryness, to give 2.75 g of oily product, which is used as it is in the following step.

7.3. 2-(ethyloxy)-2-oxoethyl 4-[(1-naphthalenyloxy)methyl]-1-piperidinecarboxylate

A solution of 2.75 g (11.4 mmol) of 4-[(1-naphthalenyloxy)methyl]piperidine, prepared in Step 7.2., and 2.56 g (11.4 mmol) of ethyl [(phenyloxy-carbonyl)oxy]acetate, prepared in accordance with Example 1.1, in 80 ml of toluene is heated at 50° C. overnight. It is evaporated to dryness and the residue is taken up in a mixture of water, dichloromethane and saturated aqueous sodium hydrogen carbonate solution. The organic phase is decanted, dried over sodium sulfate and evaporated to dryness. The product is purified by chromatography on silica gel, eluting with a 50/50 mixture of cyclohexane and dichloromethane and then with dichloromethane and with a 95/5 mixture of dichloromethane and ethyl acetate. This gives 2.05 g of product in oil form, which is used as it is in the following step.

7.4. 2-amino-2-oxoethyl 4-[(1-naphthalenyl-oxy)methyl]-1-piperidinecarboxylate

1.0 g (2.69 mmol) of 2-(ethyloxy)-2-oxoethyl 4-[(1-naphthalenyloxy)methyl]-1-piperidinecarboxylate, prepared in Step 7.3., is dissolved in 12 ml of a 7N solution of ammonia (84 mmol) in methanol. The solution is left to react at ambient temperature for 3 days. It is evaporated to dryness and the residue is purified by chromatography on silica gel, eluting with a 90/10 then 80/20, 70/30 and 50/50 mixture of dichloromethane and ethyl acetate and then with a 95/5 mixture of ethyl acetate and methanol. The eluate is subsequently recrystallized from ethyl acetate, to give 0.77 g of product.

Melting point (° C.): 135-136

LC-MS: M+H=343

¹H NMR (DMSO) δ(ppm): 8.15 (dd, 1H), 7.80 (dd, 1H), 7.50-7.30 (m, 4H), 7.30 (m, 1H), 7.15 (m, 1H), 6.95 (d, 1H), 4.35 (s, 2H), 4.15-4.00 (m+d, 4H), 4.90 (m, 2H), 2.10 (m, 1H), 1.90 (d, 2H), 1.45-1.25 (m, 2H)

Example 8 Compound 148 2-amino-2-oxoethyl 4-[(7-quinolinyloxy)methyl]-1-piperidinecarboxylate

8.1. 2-(methyloxy)-2-oxoethyl 4-(hydroxymethyl)-1-piperidinecarboxylate

The procedure described in Example 2.1. is repeated, using 6.84 g (59.4 mmol) of 4-(hydroxy-methyl)piperidine, in place of ethanolamine, to give 7.85 g of product in colorless oil form.

8.2. 2-amino-2-oxoethyl 4-[(7-quinolinyl-oxy)methyl]-1-piperidinecarboxylate

0.26 g (1.03 mmol) of 1,1′-(azodicarbonyl)-dipiperidine (ADDP) is added to a solution of 0.16 g (0.69 mmol) of 2-(methyloxy)-2-oxoethyl 4-(hydroxymethyl)-1-piperidinecarboxylate, prepared in Step 8.1., 0.26 ml (1.03 mmol) of tri-n-butylphosphine and 0.13 g (0.90 mmol) of 7-hydroxyquinoline in 2.5 ml of benzene, which is cooled by means of an ice bath. The mixture is stirred at 0° C. for 15 minutes and then at ambient temperature for 16 hours. It is filtered over celite and rinsed with diethyl ether. The filtrates are evaporated to dryness and purified by chromatography on silica gel, eluting with a 70/30 mixture of ethyl acetate in n-hexane. The product obtained is dissolved in 3 ml (21 mmol) of a 7M solution of ammonia in methanol. The solution is stirred for 3 hours and then evaporated to dryness. The product is purified by chromatography on silica gel, eluting with a 90/10 mixture of ethyl acetate in ethanol, and recrystallized from ethyl acetate, to give 0.115 g of product in white solid form.

Melting point (° C.): 137-139

LC-MS: M+H=344

¹H NMR (CDCl₃) δ(ppm): 7.80 (dd, 1H), 8.05 (dd, 1H), 7.70 (d, 1H), 7.40 (d, 1H), 7.30-7.15 (m, 2H), 6.05 (m, 1H), 5.65 (m, 1H), 4.60 (s, 2H), 4.25 (m, 2H), 4.00 (d, 2H), 2.90 (m, 2H), 2.10 (m, 1H), 1.95 (d, 2H), 1.50-1.30 (m, 2H)

Example 9 Compound 168 2-(methylamino)-2-oxoethyl 4-{2-[(4-bromophenyl)-oxy]ethyl}-1-piperidinecarboxylate

9.1. 1,1-dimethylethyl 4-{2-[(4-bromophenyl)-oxy]ethyl}-1-piperidinecarboxylate

The procedure described in Example 4.1. is repeated. Starting from 1.93 g (8.4 mmol) of 1,1-dimethylethyl 4-(2-hydroxyethyl)-1-piperidine-carboxylate and 5.88 g (33.6 mmol) of 1-bromo-4-fluorobenzene gives 4.1 g of crude product in oil form.

9.2. 4-{2-[(4-bromophenyl)oxy]ethyl}-piperidine

The procedure described in Example 4.2. is repeated. Starting from 1,1-dimethylethyl 4-{2-[(4-bromophenyl)oxy]ethyl}-1-piperidinecarboxylate, prepared in Step 9.1., gives 1.79 g of product in powder form.

Melting point (° C.): 100-102

9.3. 2-(ethyloxy)-2-oxoethyl 4-{2-[(4-bromophenyl)oxy]ethyl}-1-piperidinecarboxylate

The procedure described in Example 4.3. is repeated. Starting from 1.76 g (6.19 mmol) of 4-{2-[(4 bromophenyl)oxy]ethyl} prepared in Step 9.2., and 1.39 g (6.19 mmol) of ethyl{[(phenyloxy)carbonyl]oxy}-acetate, prepared in accordance with Example 1.1., gives 1.4 g of product in oil form.

9.4. 2-(methylamino)-2-oxoethyl 4-{2-[(4-bromophenyl)oxy]ethyl}-1-piperidinecarboxylate

The procedure described in Example 4.4. is repeated. Starting from 1.3 g (3.14 mmol) of 2-(ethyloxy)-2-oxoethyl 4-{2-[(4-bromophenyl)oxy]-ethyl}-1-piperidinecarboxylate, prepared in Step 9.3., gives 0.95 g of product in powder form.

Melting point (° C.): 101-103

LC-MS: M+H=400

¹H NMR (CDCl₃) δ(ppm): 7.55 (d, 2H), 7.00 (d, 2H), 6.25 (broad s, NH), 4.90-4.70 (m, 2H), 4.50-4.25 (m, 2H), 4.20 (t, 2H), 3.20-2.90 (m, 2H), 3.10 (d, 3H), 2.05-1.90 (m, 5H), 1.55-1.30 (m, 2H)

Example 10 Compound 186 2-(methylamino)-2-oxoethyl 4-{2-[(4′-chloro-4-biphenyl)oxy]ethyl}-1-piperidinecarboxylate

The procedure described in Example 4.5 is

repeated. Starting from 0.1 g (0.25 mmol) of 2-(methylamino)-2-oxoethyl 4-{2-[(4-bromophenyl)-oxy]ethyl}-1-piperidinecarboxylate, prepared in accordance with Example 9, and 0.117 g (0.75 mmol) of 4-chlorophenylboronic acid gives 0.087 g of product in powder form.

Melting point (° C.): 104-106

LC-MS: M+H=431

¹H NMR (CDCl₃) δ(ppm): 7.70-7.50 (m, 6H), 7.10 (d, 2H), 6.20 (broad s, NH), 4.85-4.60 (m, 2H), 4.45-4.15 (m, 2H), 4.20 (t, 2H), 3.15-2.95 (m, 2H), 3.05 (d, 3H), 2.10-1.85 (m, 5H), 1.50-1.25 (m, 2H)

Example 11 Compound 183 2-amino-2-oxoethyl 4-[2-(7-isoquinolinyloxy)ethyl]-1-piperidinecarbamate

11.1. 2-(methyloxy)-2-oxoethyl 4-(2-hydroxyethyl)-1-piperidinecarboxylate

The procedure described in Example 2.1. is repeated, using 7.6 g (59.4 mmol) of 4-(2-hydroxy-ethyl)piperidine, in place of ethanolamine, to give 7.1 g of product in colorless oil form.

11.2. 2-amino-2-oxoethyl 4-[2-(7-isoquinolinyloxy)ethyl]-1-piperidinecarbamate

The procedure described in Example 8.2. is repeated, starting from 0.46 g (1.84 mmol) of ADDP, 0.30 g (1.24 mmol) of 2-(methyloxy)-2-oxoethyl 4-(2-hydroxyethyl)-1-piperidinecarboxylate, prepared in Step 11.1., 0.46 ml of tri-n-butylphosphine and 0.26 g (1.84 mmol) of 7-hydroxyisoquinoline in 4 ml of benzene. The product is purified by chromatography on silica gel, eluting with ethyl acetate and then with a 95/5 mixture of ethyl acetate and ethanol, to give 0.25 g of product in white solid form.

Melting point (° C.): 179-181

LC-MS: M+H=358

¹H NMR (CDCl₃) δ(ppm): 9.15 (s, 1H), 8.45 (d, 1H), 7.60 (d, 1H), 7.35 (dd, 1H), 7.20 (d, 1H), 6.05 (m, 1H), 5.75 (m, 1H), 4.60 (s, 2H), 4.20 (t, 4H), 2.90 (m, 2H), 1.90-1.70 (m, 5H), 1.40-1.20 (m, 2H)

Example 12 Compound 83 2-amino-2-oxoethyl 3-[(1-naphthalenyloxy)methyl]-1-pyrrolidinecarboxylate

12.1. 1,1-dimethylethyl 3-[(1-naphthalenyl-oxy)methyl]-1-pyrrolidinecarboxylate

A solution of 1.0 g (4.9 mmol) of 1,1-dimethylethyl 3-(hydroxymethyl)-1-pyrrolidinecarboxylate (described in WO 0066557), 0.95 g (6.4 mmol) of 1-naphthalenol and 1.4 g (6.9 mmol) of tri-n-butylphosphine in 40 ml of toluene and 20 ml of tetrahydrofuran, cooled under nitrogen by means of an ice bath, is admixed dropwise with a solution of 1.74 g (6.9 mmol) of ADDP. The reaction mixture is allowed to return to ambient temperature and stirring is continued for 24 hours. The mixture is filtered and the precipitate is rinsed with toluene. It is evaporated to dryness. The residue is taken up in dichloromethane and washed with a 1M aqueous sodium hydroxide solution. It is dried over sodium sulfate and evaporated to dryness. The residue is purified by chromatography on a silica gel column, eluting with dichloromethane and then with a 98/2 mixture of dichloromethane and methanol, to give 0.80 g of product in colorless oil form.

12.2. 3-[(1-naphthalenyloxy)methyl]-pyrrolidine

A solution of 0.42 g (1.28 mmol) of 1,1-dimethylethyl 3-[(1-naphthalenyloxy)methyl]-1-pyrrolidinecarboxylate, prepared in Step 12.1., in 10 ml of 1,4-dioxane and 6 ml of a 2N solution of aqueous hydrochloric acid is stirred for 6 hours. It is evaporated to dryness and then coevaporation is carried out twice with toluene. The solid residue is washed with diethyl ether. The solid is taken up in dichloromethane and concentrated ammonia solution is added until a basic pH is obtained. The system is filtered on a Whatman PTFE cartridge and the organic phase is concentrated, to give 0.21 g of oily product, which is used as it is in the following step.

12.3. 2-(ethyloxy)-2-oxoethyl 3-[(1-naphthalenyloxy)methyl]-1-pyrrolidinecarboxylate

A solution of 0.20 g (0.88 mmol) of 3-[(1-naphthalenyloxy)methyl]pyrrolidine, prepared in Step 12.2., and 0.35 g (1.5 mmol) of ethyl [(phenyloxycarbonyl)oxy]acetate, prepared in accordance with Example 1.1, in 6 ml of toluene is heated at 60° C. overnight. It is evaporated to dryness and the residue is taken up in a mixture of water, dichloromethane and saturated aqueous sodium hydrogen carbonate solution. The organic phase is decanted, dried over sodium sulfate and evaporated to dryness. The residue is purified by chromatography on a silica gel column, eluting with dichloromethane and then with a 99/1 mixture of dichloromethane and methanol. This gives 0.24 g of product in oil form, which is used as it is in the following step.

12.4. 2-amino-2-oxoethyl 3-[(1-napthalenyl-oxy)methyl]-1-pyrrolidinecarboxylate

0.24 g (0.67 mmol) of 2-(ethyloxy)-2-oxoethyl 3-[(1-naphthenyloxy)methyl]-1-pyrrolidinecarboxylate, prepared in Step 12.3., is dissolved in 15 ml of a 7N solution of ammonia (105 mmol) in methanol. The solution is stirred in a stoppered tube at ambient temperature for 3 days. It is evaporated to dryness and the residue is purified by chromatography on a silica gel column, eluting with a 97/3 then 94/6 mixture of dichloromethane and methanol. The solid obtained is triturated in diethyl ether and filtered, to give 0.15 g of product.

Melting point (° C.): 161-163

LC-MS: M+H=329

¹H NMR (DMSO) δ(ppm): 8.15 (m, 1H), 7.75 (m, 1H), 7.50-7.30 (m, 4H), 7.10-6.90 (s, 2H), 6.80 (m, 1H), 4.40 (s, 2H), 4.20-4.05 (m, 2H), 3.90-3.30 (m, 4H), 2.90-2.70 (m, 1H), 2.30-2.10 (m, 1H), 2.05-1.85 (m, 1H).

The table which follows lists the chemical structures and the physical properties of some compounds according to the invention.

TABLE

m.p. ° C. Cpd Y X m n R₁ R₂ R₃ R₄ (or M + H) 1. 4-chlorophenyl O 0 1 H H H CH₂CONHCH₃ 147-149 2. 4-chlorophenyl O 0 1 H H H CH₂CONH₂ 128-130 3. 4-chlorophenyl O 0 2 H H H CH₂CONH₂ 108-110 4. 4-chlorophenyl O 0 3 H H H CH₂CONH₂ 116-118 5. 3-chlorophenyl O 0 1 H H H CH₂CONH₂ 114-116 6. 3-chlorophenyl O 0 2 H H H CH₂CONH₂ 90-92 7. 3-chlorophenyl O 0 3 H H H CH₂CONH₂ 114-116 8. 2-chlorophenyl O 0 1 H H H CH₂CONH₂ 128-130 9. 2-chlorophenyl O 0 2 H H H CH₂CONH₂ 128-130 10. 2-chlorophenyl O 0 3 H H H CH₂CONH₂ 110-112 11. 4-cyanophenyl O 0 1 H H H CH₂CONH₂ 204-206 12. 4-cyanophenyl O 0 2 H H H CH₂CONH₂ 173-175 13. 4-cyanophenyl O 0 3 H H H CH₂CONH₂ 169-171 14. 3-cyanophenyl O 0 1 H H H CH₂CONH₂ 142-143 15. 3-cyanophenyl O 0 2 H H H CH₂CONH₂ 129-131 16. 3-cyanophenyl O 0 3 H H H CH₂CONH₂ 123-125 17. 4-iso-propylphenyl O 0 1 H H H CH₂CONH₂ 95-97 18. 4-iso-propylphenyl O 0 2 H H H CH₂CONH₂ (295) 19. 4-iso-propylphenyl O 0 3 H H H CH₂CONH₂ 103-105 20. 3-iso-propylphenyl O 0 1 H H H CH₂CONH₂ 96-98 21. 3-iso-propylphenyl O 0 2 H H H CH₂CONH₂ (295) 22. 3-iso-propylphenyl O 0 3 H H H CH₂CONH₂ 88-90 23. 4-tert-butylphenyl O 0 2 H H H CH₂CONH₂ 90-92 24. 4-tert-butylphenyl O 0 3 H H H CH₂CONH₂ (323) 25. 3-tert-butylphenyl O 0 2 H H H CH₂CONH₂ (309) 26. 3-tert-butylphenyl O 0 3 H H H CH₂CONH₂ (323) 27. 4-(1,1,3,3-tetramethylbutyl)phenyl O 0 2 H H H CH₂CONH₂ (365) 28. 4-(1,1,3,3-tetramethylbutyl)phenyl O 0 3 H H H CH₂CONH₂ (379) 29. 4-(1,1-dimethylphenylmethyl)phenyl O 0 1 H H H CH₂CONH₂ (357) 30. 4-(1,1-dimethylphenylmethyl)phenyl O 0 2 H H H CH₂CONH₂ (371) 31. 4-(1,1-dimethylphenylmethyl)phenyl O 0 3 H H H CH₂CONH₂ (385) 32. 4-phenylphenyl O 0 1 H H H CH₂CONH₂ 196-198 33. 4-phenylphenyl O 0 2 H H H CH₂CONH₂ 187-189 34. 4-phenylphenyl O 0 3 H H H CH₂CONH₂ 192-194 35. 4-(4-chlorophenyl)phenyl O 0 1 H H H CH₂CONH₂ 193-195 36. 4-(3-chlorophenyl)phenyl O 0 1 H H H CH₂CONH₂ 168-170 37. 4-(2-chlorophenyl)phenyl O 0 1 H H H CH₂CONH₂ 114-116 38. 4-(4-methoxyphenyl)phenyl O 0 1 H H H CH₂CONH₂ 194-196 39. 4-(3-methoxyphenyl)phenyl O 0 1 H H H CH₂CONH₂ (345) 40. 4-(2-methoxyphenyl)phenyl O 0 1 H H H CH₂CONH₂ 127-129 41. 3-phenylphenyl O 0 1 H H H CH₂CONH₂ 126-128 42. 3-phenylphenyl O 0 2 H H H CH₂CONH₂ 110-112 43. 3-phenylphenyl O 0 3 H H H CH₂CONH₂ 127-129 44. 3-(4-chlorophenyl)phenyl O 0 1 H H H CH₂CONH₂ 137-139 45. 3-(3-chlorophenyl)phenyl O 0 1 H H H CH₂CONH₂ 90-92 46. 3-(2-chlorophenyl)phenyl O 0 1 H H H CH₂CONH₂ 55-57 47. 3-(4-methoxyphenyl)phenyl O 0 1 H H H CH₂CONH₂ 168-170 48. 3-(3-methoxyphenyl)phenyl O 0 1 H H H CH₂CONH₂ 86-88 49. 2-phenylphenyl O 0 1 H H H CH₂CONH₂ 92-94 50. 2-phenylphenyl O 0 2 H H H CH₂CONH₂ (329) 51. 2-phenylphenyl O 0 3 H H H CH₂CONH₂ (343) 52. 2-(4-chlorophenyl)phenyl O 0 1 H H H CH₂CONH₂ 130-132 53. 2-(3-chlorophenyl)phenyl O 0 1 H H H CH₂CONH₂ 88-90 54. 2-(2-chlorophenyl)phenyl O 0 1 H H H CH₂CONH₂ (349) 55. 2-(4-methoxyphenyl)phenyl O 0 1 H H H CH₂CONH₂ 74-76 56. naphthalen-1-yl O 0 1 H H H CH₂CONH₂ (289) 57. naphthalen-1-yl O 0 2 H H H CH₂CONH₂ (303) 58. naphthalen-1-yl O 0 3 H H H CH₂CONH₂ 80-82 59. naphthalen-1-yl O 0 3 H H H CH₂CONHCH₃ 90-92 60. 4-chloronaphthalen-1-yl O 0 3 H H H CH₂CONH₂ 142-144 61. 4-chloronaphthalen-1-yl O 0 3 H H H CH₂CONHCH₃ 108-110 62. naphthalen-2-yl O 0 1 H H H CH₂CONH₂ (289) 63. naphthalen-2-yl O 0 2 H H H CH₂CONH₂ 158-160 64. naphthalen-2-yl O 0 3 H H H CH₂CONH₂ 171-173 65. 4-phenoxyphenyl O 0 1 H H H CH₂CONH₂ 158-160 66. 4-phenoxyphenyl O 0 2 H H H CH₂CONH₂ 141-143 67. 4-phenoxyphenyl O 0 3 H H H CH₂CONH₂ 144-146 68. pyridin-3-yl O 0 1 H H H CH₂CONH₂ 135-137 69. pyridin-3-yl O 0 2 H H H CH₂CONH₂ 119-121 70. pyridin-3-yl O 0 3 H H H CH₂CONH₂ 96-98 71. 5-chloroquinolin-8-yl O 0 1 H H H CH₂CONH₂ 232-234 72. 5-chloroquinolin-8-yl O 0 2 H H H CH₂CONH₂ 183-185 73. 5-chloroquinolin-8-yl O 0 3 H H H CH₂CONH₂ 184-186 74. phenyl O 1 0 H H CH₃ CH₂CONH₂ 90-92 75. 4-CF₃phenyl O 0 2 (CH₂)₂ H CH₂CONH₂ 115-117 76. 4-Cl-phenyl SO₂ 0 2 (CH₂)₂ H CH₂CONH₂ 164-166 77. 4-Cl-phenyl SO₂ 0 2 (CH₂)₂ H CH₂CONHCH₃ 168-170 78. 3-CF₃-phenyl SO₂ 0 2 (CH₂)₂ H CH₂CONH₂ 148-150 79. 3-CF₃-phenyl SO₂ 0 2 (CH₂)₂ H CH₂CONHCH₃ 163-165 80. naphthalen-1-yl O 0 1 (CH₂)₂ H CH₂CONHCH₃ 111-113 81. naphthalen-1-yl O 1 1 CH₂ H CH₂CONH₂ 176-178 82. naphthalen-1-yl O 1 1 CH₂ H CH₂CONHCH₃ 112-114 83. naphthalen-1-yl O 1 1 (CH₂)₂ H CH₂CONH₂ 161-163 84. naphthalen-1-yl O 1 1 (CH₂)₂ H CH₂CONHCH₃  99-101 85. 4-(4-F-phenyl)phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ 117-119 86. 4-(4-Cl-phenyl)phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ 134-136 87. 4-(4-CH₃-phenyl)phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ 121-123 88. 4-(4-n-butyl-phenyl)phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ 105-107 89. 4-(4-CF₃-phenyl)phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ 141-143 90. 4-(4-CH₃O-phenyl)phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ 152-154 91. 4-(4-C₂H₅O-phenyl)phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ 145-147 92. 4-(4-CF₃O-phenyl)phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ 131-133 93. 4-(3-F,4-CH₃O-phenyl)phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ (417) 94. 4-(3-Cl,4-F-phenyl)phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ 124-126 95. 4-(3,4-Cl₂-phenyl)phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ (438) 96. 3-(4-F-phenyl)phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ (387) 97. 3-(4-Cl-phenyl)phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ (403) 98. 3-(4-CH₃-phenyl)phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ (383) 99. 3-(4-n-butylphenyl)phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ (425) 100. 3-(4-CF₃-phenyl)phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ (437) 101. 3-(4-CH₃O-phenyl)phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ (399) 102. 3-(4-C₂H₅O-phenyl)phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ (413) 103. 3-(4-CF₃O-phenyl)phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ (453) 104. 3-(3-F,4-CH₃O-phenyl)phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ (417) 105. 3-(3-Cl,4-F-phenyl)-phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ (421) 106. 3-(3,4-Cl₂-phenyl)phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ (438) 107. 3-(2,4-Cl₂-phenyl)phenyl O 0 2 (CH₂)₂ H CH₂CONHCH₃ (438) 108. naphthalen-1-yl O 0 2 (CH₂)₂ H CH₂CONH₂ 137-138 109. naphthalen-1-yl O 0 2 (CH₂)₂ H CH₂CONHCH₃ 121-122 110. naphthalen-2-yl O 0 2 (CH₂)₂ H CH₂CONH₂ 118-120 111. quinolin-8-yl O 0 2 (CH₂)₂ H CH₂CONH₂ (330) 112. phenyl O 1 2 (CH₂)₂ H CH₂CONH₂ 123-125 113. 4-Cl-phenyl O 1 2 (CH₂)₂ H CH₂CONH₂ 152-154 114. 4-Cl-phenyl O 1 2 (CH₂)₂ H CH₂CONHCH₃ 166-168 115. 4-Cl-phenyl S 1 2 (CH₂)₂ H CH₂CONHCH₃ 130-132 116. 4-Cl-phenyl SO₂ 1 2 (CH₂)₂ H CH₂CONHCH₃ 131-133 117. 3-Cl-phenyl O 1 2 (CH₂)₂ H CH₂CONH₂ 131-133 118. 3-Cl-phenyl S 1 2 (CH₂)₂ H CH₂CONHCH₃ 94-96 119. 3-Cl-phenyl SO₂ 1 2 (CH₂)₂ H CH₂CONHCH₃ 100-102 120. 4-Br-phenyl O 1 2 (CH₂)₂ H CH₂CONHCH₃ 163-165 121. 4-CH₃O-phenyl O 1 2 (CH₂)₂ H CH₂CONH₂ 128-130 122. 3-CH₃O-phenyl O 1 2 (CH₂)₂ H CH₂CONH₂ 119-121 123. 4-n-propyloxyphenyl O 1 2 (CH₂)₂ H CH₂CONH₂ 141-143 124. 4-CF₃-phenyl O 1 2 (CH₂)₂ H CH₂CONH₂ 134-136 125. 4-CF₃-phenyl S 1 2 (CH₂)₂ H CH₂CONHCH₃ 129-131 126. 4-CF₃-phenyl SO₂ 1 2 (CH₂)₂ H CH₂CONHCH₃ 103-105 127. 3-CF₃-phenyl O 1 2 (CH₂)₂ H CH₂CONH₂ 120-121 128. 3-CF₃-phenyl S 1 2 (CH₂)₂ H CH₂CONHCH₃ 167-169 129. 3-CF₃-phenyl SO₂ 1 2 (CH₂)₂ H CH₂CONHCH₃ 141-143 130. 4-CF₃O-phenyl O 1 2 (CH₂)₂ H CH₂CONH₂ 118-120 131. 3-CF₃O-phenyl O 1 2 (CH₂)₂ H CH₂CONH₂ 132-134 132. 4-isopropylphenyl O 1 2 (CH₂)₂ H CH₂CONH₂ 113-115 133. 3-isopropylphenyl O 1 2 (CH₂)₂ H CH₂CONH₂ 119-121 134. 2,3-Cl₂-phenyl O 1 2 (CH₂)₂ H CH₂CONHCH₃ 160-162 135. 2,4-Cl₂-phenyl O 1 2 (CH₂)₂ H CH₂CONHCH₃ 144-146 136. 3,4-Cl₂-phenyl O 1 2 (CH₂)₂ H CH₂CONH₂ 113-115 137. naphthalen-1-yl O 1 2 (CH₂)₂ H CH₂CONH₂ 135-136 138. naphthalen-1-yl O 1 2 (CH₂)₂ H CH₂CONHCH₃ 151-152 139. naphthalen-1-yl O 1 1 (CH₂)₃ H CH₂CONH₂ 149-151 140. naphthalen-1-yl O 1 1 (CH₂)₃ H CH₂CONHCH₃ (357) 141. naphthalen-1-yl S 1 2 (CH₂)₂ H CH₂CONHCH₃ 127-129 142. naphthalen-1-yl SO₂ 1 2 (CH₂)₂ H CH₂CONHCH₃ 154-156 143. naphthalen-2-yl O 1 2 (CH₂)₂ H CH₂CONH₂ 142-144 144. naphthalen-2-yl S 1 2 (CH₂)₂ H CH₂CONHCH₃ 111-113 145. naphthalen-2-yl SO₂ 1 2 (CH₂)₂ H CH₂CONHCH₃ 105-107 146. 4-chloronaphthalen-1-yl O 1 2 (CH₂)₂ H CH₂CONH₂ 166-168 147. 4-chloronaphthalen-1-yl O 1 2 (CH₂)₂ H CH₂CONHCH₃ 163-165 148. quinolin-7-yl O 1 2 (CH₂)₂ H CH₂CONH₂ 137-139 149. isoquinolin-7-yl O 1 2 (CH₂)₂ H CH₂CONH₂ 162-164 150. 4-(4-F-phenyl)phenyl O 1 2 (CH₂)₂ H CH₂CONHCH₃ 150-152 151. 4-(4-Cl-phenyl)phenyl O 1 2 (CH₂)₂ H CH₂CONHCH₃ 167-169 152. 4-(4-CH₃-phenyl)phenyl O 1 2 (CH₂)₂ H CH₂CONHCH₃ 164-166 153. 4-(4-n-butyl-phenyl)-phenyl O 1 2 (CH₂)₂ H CH₂CONHCH₃ 171-173 154. 4-(4-CF₃-phenyl)phenyl O 1 2 (CH₂)₂ H CH₂CONHCH₃ 197-199 155. 4-(4-CH₃O-phenyl)phenyl O 1 2 (CH₂)₂ H CH₂CONHCH₃ 172-174 156. 4-(4-C₂H₅O-phenyl)phenyl O 1 2 (CH₂)₂ H CH₂CONHCH₃ 173-175 157. 4-(4-CF₃O-phenyl)phenyl O 1 2 (CH₂)₂ H CH₂CONHCH₃ 152-154 158. 4-(3-F,4-CH₃O-phenyl)-phenyl O 1 2 (CH₂)₂ H CH₂CONHCH₃ 156-158 159. 4-(3-Cl,4-F-phenyl)-phenyl O 1 2 (CH₂)₂ H CH₂CONHCH₃ 132-134 160. 4-(3,4-Cl₂-phenyl)phenyl O 1 2 (CH₂)₂ H CH₂CONHCH₃ 163-165 161. 4-(2,4-Cl₂-phenyl)phenyl O 1 2 (CH₂)₂ H CH₂CONHCH₃ 177-179 162. pyrimidin-2-yl S 1 2 (CH₂)₂ H CH₂CONHCH₃ 109-111 163. 5-phenylthiazol-2-yl S 1 2 (CH₂)₂ H CH₂CONHCH₃ (406) 164. benzoxazol-2-yl S 1 2 (CH₂)₂ H CH₂CONHCH₃ (364) 165. phenyl O 2 2 (CH₂)₂ H CH₂CONH₂ 136-138 166. 4-Cl-phenyl O 2 2 (CH₂)₂ H CH₂CONH₂ 115-117 167. 3-Cl-phenyl O 2 2 (CH₂)₂ H CH₂CONH₂ 91-93 168. 4-Br-phenyl O 2 2 (CH₂)₂ H CH₂CONHCH₃ 101-103 169. 4-CH₃O-phenyl O 2 2 (CH₂)₂ H CH₂CONH₂ 108-110 170. 3-CH₃O-phenyl O 2 2 (CH₂)₂ H CH₂CONH₂ (337) 171. 4-n-propyloxy-phenyl O 2 2 (CH₂)₂ H CH₂CONH₂ 121-123 172. 4-CF₃-phenyl O 2 2 (CH₂)₂ H CH₂CONH₂ 112-114 173. 3-CF₃-phenyl O 2 2 (CH₂)₂ H CH₂CONH₂ 94-96 174. 4-CF₃O-phenyl O 2 2 (CH₂)₂ H CH₂CONH₂ 79-81 175. 3-CF₃O-phenyl O 2 2 (CH₂)₂ H CH₂CONH₂ (391) 176. 4-isopropylphenyl O 2 2 (CH₂)₂ H CH₂CONH₂ 75-77 177. 3-isopropylphenyl O 2 2 (CH₂)₂ H CH₂CONH₂ (349) 178. 3,4-Cl₂-phenyl O 2 2 (CH₂)₂ H CH₂CONH₂ 103-105 179. naphthalen-1-yl O 2 2 (CH₂)₂ H CH₂CONH₂ 134-135 180. naphthalen-1-yl O 2 2 (CH₂)₂ H CH₂CONHCH₃ 108-109 181. naphthalen-2-yl O 2 2 (CH₂)₂ H CH₂CONH₂ (357) 182. quinolin-7-yl O 2 2 (CH₂)₂ H CH₂CONH₂ 164-166 183. isoquinolin-7-yl O 2 2 (CH₂)₂ H CH₂CONH₂ 179-181 184. 4-phenylphenyl O 2 2 (CH₂)₂ H CH₂CONHCH₃ 124-126 185. 4-(4-F-phenyl)phenyl O 2 2 (CH₂)₂ H CH₂CONHCH₃ 120-122 186. 4-(4-Cl-phenyl)phenyl O 2 2 (CH₂)₂ H CH₂CONHCH₃ 104-106 187. 4-(4-CF₃-phenyl)phenyl O 2 2 (CH₂)₂ H CH₂CONHCH₃ 137-139 188. 4-(3-CF₃-phenyl)phenyl O 2 2 (CH₂)₂ H CH₂CONHCH₃  98-100 189. 4-(4-CH₃O-phenyl)phenyl O 2 2 (CH₂)₂ H CH₂CONHCH₃ 141-143 190. 4-(4-CF₃O-phenyl)phenyl O 2 2 (CH₂)₂ H CH₂CONHCH₃ 116-118 191. 4-(4-iso-propyl-phenyl)phenyl O 2 2 (CH₂)₂ H CH₂CONHCH₃ 121-123 192. 4-(2,4-Cl₂-phenyl)phenyl O 2 2 (CH₂)₂ H CH₂CONHCH₃ 112-114

The compounds of the invention were subjected to pharmacological tests permitting determination of their inhibitory effect on the enzyme FAAH (Fatty Acid Amide Hydrolase).

The inhibitory activity was demonstrated in a radioenzymatic assay based on measuring the product of hydrolysis (ethanolamine [1-³H]) of anandamide [ethanolamine 1-³H] by FAAH (Life Sciences (1995), 56, 1999-2005 and Journal of Pharmacology and Experimental Therapeutics (1997), 283, 729-734). Accordingly, mouse brains (minus the cerebellum) are removed and stored at −80° C. Membrane homogenates are prepared at the time of use by homogenizing the tissues in a Polytron in a 10 mM Tris-HCl buffer (pH 8.0) containing 150 mM NaCl and 1 mM EDTA. The enzyme reaction is subsequently conducted in 70 μl of buffer containing bovine serum albumin without fatty acids (1 mg/ml). In succession, the test compounds, at various concentrations, anandamide [ethanolamine 1-³H] (specific activity: 15-20 Ci/mmol) diluted to 10 μM with cold anandamide, and the membrane preparation (400 μg of frozen tissue per assay) are added. After 15 minutes at 25° C. the enzyme reaction is terminated by adding 140 μl of chloroform/methanol (2:1). The mixture is stirred for 10 minutes and then centrifuged for 15 minutes at 3500 g. An aliquot (30 μl) of the aqueous phase containing the ethanolamine [1-³H] is counted by liquid scintillation.

Under these conditions, the most active compounds of the invention exhibit IC₅₀ values (concentration inhibiting by 50% the control enzyme activity of FAAH) of between 0.001 and 1 μM. For example, compound 58 of the table exhibits an IC₅₀ of 0.47 μM.

It is therefore apparent that the compounds according to the invention have an inhibitory effect on the FAAH enzyme.

The in vivo activity of the compounds of the invention was evaluated in an analgesia test.

Accordingly, intraperitoneal (i.p.) administration of PBQ (phenylbenzoquinone, 2 mg/kg in a 0.9% sodium chloride solution containing 5% of ethanol) to male OF1 mice weighing 25 to 30 g causes abdominal stretches, on average 30 twists or contractions during the period from 5 to 15 minutes after injection. The test compounds are administered orally in suspension in Tween 80 at 0.5%, 60 minutes or 120 minutes before the administration of PBQ. Under these conditions the most potent compounds of the invention reduce by 35 to 70% the number of stretches induced by PBQ, within a dose range of between 1 and 30 mg/kg. For example, compound 58 of the table reduces by 51% the number of stretches induced by PBQ, at a dose of 1 mg/kg at 2 hours.

The enzyme FAAH (Chemistry and Physics of Lipids, (2000), 108, 107-121) catalyses the hydrolysis of endogenous derivatives of amides and of esters of various fatty acids such as N-arachidonylethanolamine (anandamide), N-palmitoylethanolamine, N-oleoyl-ethanolamine, oleamide or 2-arachidonoylglycerol. These derivatives exert various pharmacological activities by interacting, inter alia, with cannabinoid and vanilloid receptors.

The compounds of the invention block this degradation pathway and increase the tissue level of these endogenous substances. They can be used in this respect in the prevention and treatment of pathologies in which endogenous cannabinoids and/or any other substrates metabolized by the FAAH enzyme are involved.

Mention may be made, for example, of the following diseases and conditions: pain, especially acute or chronic pain of the neurogenic type: migraine, neuropathic pain, including forms associated with the herpes virus and with diabetes; acute or chronic pain associated with inflammatory diseases: arthritis, rheumatoid arthritis, osteoarthritis, spondylitis, gout, vasculitis, Crohn's disease, irritable bowel syndrome;

acute or chronic peripheral pain;

dizziness, vomiting, nausea, especially those subsequent to chemotherapy;

eating disorders, especially anorexia and cachexia of various kinds;

neurological and psychiatric pathologies: shaking, dyskinesia, dystonia, spasticity, obsessive-compulsive behaviors, Tourette's syndrome, all forms of depression and anxiety of any kind and cause, mood disorders, psychoses; acute and chronic neurodegenerative diseases: Parkinson's disease, Alzheimer's disease, senile dementia, Huntington's chorea, lesions associated with cerebral ischemia and with cranial and medullary trauma; epilepsy; sleep disorders, including sleep apnea; cardiovascular diseases, especially hypertension, cardiac arrhythmias, arteriosclerosis, heart attack, cardiac ischemias; renal ischemia; cancers: benign skin tumors, papillomas and brain tumors, prostate tumors, brain tumors (glioblastomas, medulloepitheliomas, medulloblastomas, neuroblastomas, tumors of embryonic origin, astrocytomas, astroblastomas, ependyomas, oligodendrogliomas, plexus tumor, neuroepitheliomas, epiphyseal tumor, ependymoblastomas, malignant meningiomas, sarcomatoses, malignant melanomas, schwannomas); disorders of the immune system, especially autoimmune diseases: psoriasis, lupus erythematosis, diseases of the connective tissue or collagen diseases, Sjögren's syndrome, ankylosing spondylarthritis, undifferentiated spondylarthritis, Behcet's disease, haemolytic autoimmune anaemias, multiple sclerosis, amyotrophic lateral sclerosis, amyloses, transplant rejection, diseases affecting the plasmocytic line; allergic diseases: immediate or delayed hypersensitivity, allergic rhinitis or conjunctivitis, contact dermatitis; parasitic, viral or bacterial infectious diseases: AIDS, meningitis; inflammatory diseases, especially diseases of the joints: arthritis, rheumatoid arthritis, osteoarthritis, spondylitis, gout, vasculitis, Crohn's disease, irritable bowel syndrome; osteoporosis; ocular conditions: ocular hypertension, glaucoma; pulmonary conditions: diseases of the respiratory tracts, bronchospasms, coughing, asthma, chronic bronchitis, chronic obstruction of the respiratory tracts, emphysema; gastrointestinal diseases: irritable bowel syndrome, intestinal inflammatory disorders, ulcers, diarrhea; urinary incontinence and bladder inflammation.

The use of compounds of formula (I) in base, salt, hydrate or pharmaceutically acceptable solvate form for preparing a medicinal product intended for treating the abovementioned pathologies forms an integral part of the invention.

The invention likewise provides medicinal products which comprise a compound of formula (I), or a salt or else a hydrate or a pharmaceutically acceptable solvate of the compound of formula (I). These medicinal products are employed in therapy, particularly in the treatment of the above-mentioned pathologies.

In accordance with another of its aspects the present invention provides pharmaceutical compositions comprising as active principle at least one compound of formula (I). These pharmaceutical compositions include an effective dose of a compound according to the invention, or a salt or a hydrate or pharmaceutically acceptable solvate of the said compound, and optionally one or more pharmaceutically acceptable excipients.

Said excipients are selected, according to the pharmaceutical form and the desired mode of administration, from the customary excipients, which are known to the person skilled in the art.

In the pharmaceutical compositions of the present invention for oral, sublingual, subcutaneous, intramuscular, intravenous, topical, local, intrathecal, intranasal, transdermal, pulmonary, ocular or rectal administration the active principle of formula (I) above, or its salt, solvate or hydrate where appropriate, may be administered in single-dose administration form, in a mixture with conventional pharmaceutical excipients, to animals and to humans for the prophylaxis or treatment of the above disorders or diseases.

The unit-dose administration forms which are appropriate include oral forms such as tablets, soft or hard gelatin capsules, powders, granules, chewing gums and oral solutions or suspensions, forms for sublingual, buccal, intratracheal, intraocular and intranasal administration and for administration by inhalation, forms for subcutaneous, intramuscular or intravenous administration and forms for rectal or vaginal administration. For topical application the compounds according to the invention may be used in creams, ointments or lotions.

By way of example a single-dose administration form of a compound according to the invention in tablet form may comprise the following components:

Compound according to the invention 50.0 mg Mannitol 223.75 mg Croscaramellose sodium 6.0 mg Maize starch 15.0 mg Hydroxypropyl-methylcellulose 2.25 mg Magnesium stearate 3.0 mg

The said single-dose forms contain a dose permitting daily administration of from 0.01 to 20 mg of active principle per kg of bodyweight, depending on the pharmaceutical form.

There may be particular cases in which higher or lower dosages are appropriate; such dosages also belong to the invention. In accordance with common practice the dosage appropriate to each patient is determined by the doctor according to the method of administration, the weight and the response of the said patient.

According to another of its aspects the invention also provides a method of treating the pathologies indicated above, which comprises administering an effective dose of a compound according to the invention, one of its pharmaceutically acceptable salts, or a solvate or a hydrate of the said compound.

Although the invention has been illustrated by certain of the preceding examples, it is not to be construed as being limited thereby; but rather, the invention encompasses the generic area as hereinbefore disclosed. Various modifications and embodiments can be made without departing from the spirit and scope thereof. 

1. A method of treating a disease selected from the group consisting of acute or chronic pain and anxiety in a patient comprising administering to said patient a therapeutically effective amount of a compound of formula (I) or a pharmaceutically acceptable salt thereof:

wherein m is 0, 1, 2 or 3; n is 0, 1, 2 or 3; X is oxygen, sulfur, SO or SO₂; R₁ and R₂ are independently of one another hydrogen or C₁₋₃ alkyl; or R₁ and R₂ together form a group —(CH₂)_(p)—, where p represents an integer ranging from 1 to 5 such that n+p is an integer ranging from 2 to 5; R₃ is hydrogen, fluorine, hydroxyl or methyl; R₄ is a group of formula CHR₅CONHR₆; wherein R₅ is hydrogen or C₁₋₆ alkyl; and R₆ is hydrogen, C₁₋₆ alkyl, C₃₋₇ cycloalkyl or C₃₋₇ cycloalkyl-C₁₋₆ alkylene; and Y is selected from phenyl, pyridinyl, pyridazinyl, pyrimidinyl, pyrazinyl, triazinyl, thiazolyl, naphthyl, quinolinyl, isoquinolinyl, phthalazinyl, quinazolinyl, quinoxalinyl, naphthyridinyl, cinnolinyl, benzofuranyl, dihydrobenzofuranyl, benzothienyl, dihydrobenzothienyl, indolyl, isoindolyl, indolinyl, benzimidazolyl, benzoxazolyl, benzisoxazolyl, benzothiazolyl, benzisothiazolyl, benzotriazolyl, benzoxadiazolyl and benzothiadiazolyl; said Y is optionally substituted by one or more substituents Y₂, which are identical to or different from one another, or by Y₃; wherein Y₂ is halogen, cyano, nitro, C₁₋₈ alkyl, C₁₋₈ alkoxy, C₁₋₈ thioalkyl, C₁₋₈ fluoroalkyl, C₁₋₈ fluoroalkoxy, C₁₋₈ fluorothioalkyl, C₃₋₇ cycloalkyl, C₃₋₇ cycloalkyloxy, C₃₋₇ cycloalkyl-C₁₋₈ alkylene, C₃₋₇ cycloalkyl-C₁₋₈ alkyloxy, hydroxyl, NR₇R₈, NHCOR₇, NHSO₂NR₇, COR₈, CO₂R₇, CONR₇R₈, SO₂R₇, SO₂NR₇R₈, —O—(C₁₋₃ alkylene)-O—, phenyloxy, phenylthio, phenyl-C₁-C₈ alkylene, phenyl-C₁-C₈ alkyloxy or phenyl-C₁-C₈ alkylthio group; Y₃ is selected from phenyl, pyridinyl, pyrimidinyl, pyrazinyl or pyridazinyl; said Y₃ is optionally substituted by one or more substituents selected from Y₂ which are identical to or different from one another; R₇ and R₈ are independently of one another hydrogen or C₁₋₆ alkyl; or R₇ and R₈ with the nitrogen atom carrying them form an azetidine, pyrrolidine, piperidine, morpholine, thiomorpholine, azepine or piperazine ring optionally substituted by C₁₋₃ alkyl or benzyl; with the proviso that, when R₁ and R₂ are independently of one another hydrogen or C₁₋₃ alkyl, m+n>1.
 2. The method according to claim 1, wherein said disease is acute or chronic pain.
 3. The method according to claim 1, wherein said acute or chronic pain is selected from migraine, neuropathic pain and acute or chronic pain associated with inflammatory disease.
 4. The method according to claim 3, wherein said neuropathic pain is selected from pain associated with the herpes virus and with diabetes.
 5. The method according to claim 3, wherein said chronic pain associated with inflammatory disease is selected from arthritis, rheumatoid arthritis, osteoarthritis, spondylitis, gout, vasculitis, Crohn's disease and irritable bowel syndrome.
 6. The method according to claim 1, wherein said disease is anxiety. 